物理学是建立在实验基础上的一门科学。合理选用实验器件是做好实验的前提,是提高学生实验能力的一项基本要求。因此,近几年高考中,常要求考生能合理选用实验器件。笔者认为选用实验器件一般应根据实验原理掌握“可行”、“精确”和“方便”的原则。所谓“可行”,是指选用的实验器件要能保证实验的正常进行。比如,在电学实验中,线路中的限流电阻必须满足要求,确保电流不超过允许值,通过安培表的电流或加 Physics is a science based on experiments. Reasonable selection of experimental devices is a prerequisite for good experimentation and a basic requirement for improving students’ experimental ability. Therefore, in the college entrance examination in recent years, candidates are often required to use experimental devices rationally. The author believes that the selection of experimental devices should generally be based on experimental principles to grasp the “feasible”, “accurate” and “convenient” principle. The so-called “feasible” refers to the selection of experimental devices to ensure the normal operation of the experiment. For example, in electrical experiments, the current limiting resistance in the line must meet the requirements to ensure that the current does not exceed the allowable value, through the Ampere meter current or